You may want to read 230/8's piece on kettering ignitions. You can set yours up just as he says, bypassing the switchgear and the car will run. The switchgear was intended to extend the life of the points and provide a consistant spark but does not alter timing or dwell as a modern ignition does. It is also NOT a capacitive discharge ignition.

The debate on hall effect VS photo diode will rage on for ever but I went with the Crane XR700 in the 280C because it was $45 (remanufactured) and the XR3000 in the 250C because Pertronix didn't list a kit for it.

Here is a link to all kinds of good stuff if you can get past the fact that it's intended for MG's


Michael

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Usta haves '69 250/8, '76 280C, 1971 250C 114.023, 1976 450SEL 116.033
Current have, 1983 300SD 126.120